Here's what looks like the baptism of Frances Betts (irishgenealogy.ie):
Area - DUBLIN (COI) , Parish/Church/Congregation - ST. MATTHEW
Baptism of FRANCES BETTS of IRISHTOWN on 18 March 1838
Name FRANCES BETTS
Date of Birth 2 December 1832
Father THOMAS BETTS
Father Occupation SCHOOL MASTER
There are also baptisms on the site for siblings of Frances. Her marriage to John Miller is also there, + lots of other Betts records who seem to be related in some way.